You can leave a message for Chanyeol which will be folded in a paper crane. You can leave as much msgs you want and if you want you can write it yourself and send it to marchen.It can also be in English and marchen will write a little subtitle in Korean at the bottom of the message

You can write happy birthday Chanyeol on a paper, take a picture of it and send it to yeolmaefarm.You can also leave a message for Chanyeol which will be in the bday message book, and if you make a Chanyeol birthday fanart you can send it to them. You can also send personal gifts and letters and donate for the gifts support fundraising.